package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.manager.auth.StpKit;
import com.yupi.yupicturebackend.mapper.UserMapper;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVo;
import com.yupi.yupicturebackend.model.vo.UserVo;
import com.yupi.yupicturebackend.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.yupi.yupicturebackend.constant.UserConstant.USER_LOGIN_STATE;

/**
 * @author 18319
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-03-05 20:56:19
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
        implements UserService {


    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        //1.校验参数
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }

        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }

        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }

        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        //2.检查是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        Long count = this.baseMapper.selectCount(queryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        //3.加密
        String encryptPassword = getEncryptPassword(userPassword);
        //4.插入数据到数据库
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("无名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if (!saveResult) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
        }
        return user.getId();
    }

    @Override
    public LoginUserVo userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 参数校验
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }

        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号错误");
        }

        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码错误");
        }
        // 2.密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 3.查询数据库
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        if (ObjectUtil.isEmpty(user)) {
            log.error("user login failed,userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }
        // 4.保存用户的登陆状态
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        // 记录用户登录态到Sa-token ，便于空间鉴权时使用，主要保证该用户信息与springSession中的信息过时间一致
        StpKit.SPACE.login(user.getId());
        StpKit.SPACE.getSession().set(USER_LOGIN_STATE,user);
        return this.getLoginUserVo(user);
    }


    @Override
    public String getEncryptPassword(String userPassword) {
        // 加盐
        final String SALT = "yupi";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    @Override
    public LoginUserVo getLoginUserVo(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVo loginUserVo = new LoginUserVo();
        BeanUtil.copyProperties(user, loginUserVo);
        return loginUserVo;
    }

    @Override
    public UserVo getUserVo(User user) {
        if (user == null) {
            return null;
        }
        UserVo userVo = new UserVo();
        BeanUtil.copyProperties(user, userVo);
        return userVo;
    }

    @Override
    public List<UserVo> getUserVoList(List<User> userList) {
        if (CollectionUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }

        return userList.stream()
                .map(this::getUserVo)
                .collect(Collectors.toList());
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        // judge login
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (ObjectUtil.isEmpty(currentUser) || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    @Override
    public boolean userLogout(HttpServletRequest request) {
        // judge login
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        if (ObjectUtil.isEmpty(userObj)) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userName = userQueryRequest.getUserName();
        String userAccount = userQueryRequest.getUserAccount();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortFiled = userQueryRequest.getSortFiled();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortFiled), sortOrder.equals("ascend"), sortFiled);
        return queryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {
        return user!=null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }
}




